Vue3 uses ResizeObserver to monitor the size and width changes of elements

To monitordivThe width changes can be usedResizeObserverInterface.ResizeObserverAllows you to observe the size changes of one or more elements and execute a callback function when it changes. This method is more useful thanMutationObserverFocus more on size changes and are not affected by changes in element attributes.

Use ResizeObserver

First, create aResizeObserverInstance, and pass in a callback function that will be called when the element size changes. In the callback function, you can access the new dimensions of each observed element.

const resizeObserver = new ResizeObserver(entries => {
  (entry => {
    const { width, height } = ;
    (`Element resized: Width=${width}, Height=${height}`);
  });
});

// Suppose the element you want to observe is a div with a specific IDconst observedElement = ('#yourDivId');

// Start observing the element(observedElement);

// When you need to stop observing, you can call the disconnect method// ();

Use in vue3

const container = ref(null);
let observer;
let resizeTimer;

onMounted(() => {
  createObserver();
});

onUnmounted(() => {
  if (observer) {
    ();
  }
});

function createObserver() {
  observer = new ResizeObserver((entries) => {
    clearTimeout(resizeTimer);
    resizeTimer = setTimeout(() => {
      for (const entry of entries) {
        const { width, height } = ;
        (width);
      }
    }, 200);
  });

  ();
}

<div ref="container"></div>

Things to note

• ResizeObserverIt is an API supported by modern browsers, not all browsers support it. Make sure your target browser supports this API, or use polyfill to provide cross-browser compatibility.
• ResizeObserverOnly changes in the dimensions of elements can be observed, and no changes in the contents or internal layout of elements can be detected.
• If you need to trigger events when the content or layout of an element changes, you may need to use other techniques in combination, such asMutationObserver。

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